EP0785213A1 - Ligands peptidiques que se lient au facteur de Von Willebrand - Google Patents

Ligands peptidiques que se lient au facteur de Von Willebrand Download PDF

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Publication number
EP0785213A1
EP0785213A1 EP96114438A EP96114438A EP0785213A1 EP 0785213 A1 EP0785213 A1 EP 0785213A1 EP 96114438 A EP96114438 A EP 96114438A EP 96114438 A EP96114438 A EP 96114438A EP 0785213 A1 EP0785213 A1 EP 0785213A1
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Prior art keywords
vwf
peptide
peptides
toyopearl
bind
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German (de)
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Christopher A. Dadd
George A. Baumbach
David J. Hammond
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Bayer Corp
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Bayer AG
Bayer Corp
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
    • C07K14/745—Blood coagulation or fibrinolysis factors
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/001—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof by chemical synthesis

Definitions

  • This invention relates generally to peptide ligands which bind to proteins., and specifically to the use of a peptide ligand to modify a chromatographic substrate tor use in affinity purification of proteins such as von Willebrand Factor.
  • vWF von Willebrand Factor
  • FVIII Factor VIII
  • vWF represents a challenge because it is a multimeric protein with molecular weight ranging from 0.5 to 10 million Daltons.
  • vWF-FVIII complex von Willebrand Factor-Factor VIII complex
  • concentrates are mixtures of vWF-FVIII among many other plasma proteins, especially albumin.
  • Methods rely on differential solubility.
  • Common precipitating agents are metal hydroxides, such as barium hydroxide or aluminum hydroxide, polyethylene glycol, and amino acids, such as glycine.
  • the relevant proteins removed by such procedures are ⁇ -globulins and fibrinogen.
  • Affinity methods have also been introduced for high purity enrichment of vWF-FVIII from plasma, including use of ligands such as lectins (11), and metal chelates. Recently, heparin has been introduced as a ligand for making vWF-FVIII complex concentrate. (12-13)
  • Hagen et al. describe purification of either vWF alone or vWF-FVIIIc complex using peptides derived from the amino acid sequence of platelet glycoprotein lb. (2) They claim purification using any peptide of at least four consecutive amino acids corresponding to amino acids 165-260 of glycoprotein lb, an integrin receptor for vWF interaction at the platelet surface.
  • vWF concentrates devoid of FVIII Chromatographic preparation of vWF concentrates devoid of FVIII have also been described.
  • Anion exchange chromatography can be used to separate FVIII from vWF (16-19), typically by including calcium ions at sufficient concentration to disrupt the vWF-FVIII complex.
  • Immunoaffinity chromatography using antibodies to vWF has been described for making high purity vWF concentrates. (20) Similar antibodies are also used to make high purity FVIII preparations (for example Monoclate) whereby FVIII is released from the vWF bound to antibody by using calcium ions. It is possible to then elute vWF from the antibody adsorbent.
  • immunoaffinity chromatography uses monoclonal antibodies as affinity ligands. At present, monoclonal antibodies must be purified extensively prior to use as affinity ligands. Therefore, the process of obtaining FDA (Food and Drug Administration) approval is lengthy and the qualities of the purified proteins may vary. In addition. immobilized antibodies are particularly sensitive to operating conditions. The harsh elution conditions often used in affinity separation processes and sanitation procedures can deplete antibody activity over time.
  • Peptide affinity chromatography using peptides as ligands has advantages over immunoaffinity chromatographyy (32).
  • One benefit is that peptide ligands consist of only a few amino acids, which, unlike large murine antibodies, are not likely to cause an immune response in case of leakage into the product.
  • Peptide ligands are also much more stable in comparison to antibody ligands. They can be manufactured aseptically in large quantities under GMP (good manufacturing practices) conditions. The interactions between binding peptides and proteins can be easily modified by synthetic methods to result in mild elution conditions for separation. (32)
  • the classic affinity interaction involves hydrophilic and hydrophobic interactions at one or several specific locations.
  • Affinity chromatography can be divided into so-called high, or biospecific, affinity chromatography, and weak, or pseudobiospecific, affinity chromatography. These terms describe differences in reversible interactions which are dependent on differences in the nature of ligands.
  • Biospecific affinity ligands depend on interactions between biologically active substances, e.g., an antibody and its antigen, whereas pseudobiospecific ligands are typically small molecules, such as dyes and metal chelates. In both biospecific and pseudobiospecific separations, the nature of reversible interactions via multiple types of complementary intramolecular bonding are the same. Typically, biospecific interactions have high binding constants, and may have increased specificity.
  • Peptides can be classified within both biospecific and pseudobiospecific affinity interactions.
  • a peptide sequence may be a subsequence of the interaction site of a protein ligand. This is the case for platelet lb derived peptides which bind vWF.
  • Specificity may be high, and the protein may be eluted by the peptide.
  • a peptide that is without any apparent sequence homology to a biological ligand still may interact with a ligate, such as the sequence HPQ which mimics biotin and binds streptavidin. (32) Biospecific and pseudobiospecific mechanisms are useful for chromatographic purification of proteins.
  • the pH of adsorption was 6.0 (range 5.8-6.1) at low ionic strength.
  • the pI of vWF is 5.8, and at this pH the interactions may not be solely ionically driven.
  • Desorption was accomplished using 0.1 M glycine, 0.3 M lysine and 0.3 M CaCl 2 , conditions useful for interfering with ionic interactions.
  • the authors also demonstrated that the histidine-Sepharose system was useful for other separations, including binding IgG, and endotoxin.
  • Peptide ligands can be found by screening phage peptide libraries.
  • Phage peptide libraries are created by the insertion of a random gene of a given length into bacterial phages which are cultivated for the expression of random peptides on the phage surfaces. Millions of phage particles, each with a different peptide, are then incubated with target protein immobilized on a Petri dish. Phage particles that are not bound specifically to the target protein are washed away. The specifically retained phages are used to infect E. coli cells for gene amplification. The amplified gene can be sequenced and the specific peptide sequence deduced.
  • a group of peptide affinity ligands that fall into the broad classification of pseudobiospecific ligands which bind to vWF.
  • This group includes the following peptide affinity ligands: RLHSFY, RLKSFY, RLNSFY, RLQSFY, RFRSFY, RIRSFY, RVRSFY, RYRSFY, RLRSFY, HLRSFY, and KLRSFY.
  • the preferred ligand is RVRSFY.
  • a method of purifying vWF which comprises passing a protein containing solution over a substrate which has bound upon it a peptide affinity ligand of the defined sequence, and then eluting the vWF.
  • Toyopearl® 650M chelate resin from TosoHaas (Montgomeryville, PA) was chosen for the amination and direct synthesis of peptides.
  • the resin was rinsed in a 25 g reaction vessel with water, methanol and dimethylformamide (DMF, Burdick & Jackson).
  • Peptides were synthesized by the solid phase method on a Gilson AMS422 Multiple Peptide Synthesizer (Middleton, WI) utilizing FMOC (9-fluorenylmethoxycarbonyl) as the ⁇ -amino protection. Briefly, each amino acid (5-fold molar excess; 1 ml of 0.5 M in DMF) was activated in-situ with PyBOP (0.5 ml of 0.3 M in DMF) and NMM (0.25 ml of 1.19 M in DMF) with our modified TosoHaas resin (0.3 g, 120 ⁇ moles) or Rink amide resin (Nova Biochem, 0.5 g, 200 ⁇ ).
  • the filter cakes were dissolved in 50% acetonitrile/water and lyophilized in a tared scintillation vial. These precipitated, unpurified peptides were dissolved at 25-50 mg/ml in 50% acetonitrile/water and 1 ml was purified by preparative HPLC (Gilson, Inc. Middleton, WI) with a 22 mm x 250 mm (C18 15 ⁇ 300 ⁇ , Vydac, Hesperia, CA) reversed phase column.
  • the analytical HPLC System, Ultrafast Microprotein Analyzer was purchased from Michrom BioResources, Inc. (Sacramento, CA). Molecular weights and sequences of peptides were verified by MS/MS determinations using fast atom bombardment mass spectrometry on a JEOL HX110HF instrument.
  • the gel slurry (1 ml wet gel mixed with 2 ml degassed PBS and 1 M sodium chloride buffer) was transferred into a packing device (from PerSeptive Biosystems, Framingham, MA) and packed into a PEEK column (0.75 cm x 5 cm from Alltech, Deerfield, IL) at a flow rate of 8 ml/min.
  • the pressure drop was 60 psi, which was within the maximum pressure drop of 120 psi suggested by the manufacturer.
  • the column was washed with at least 4 bed volumes of binding buffer (10 mM HEPES, 100 mM NaCl, 5 mM calcium chloride at pH 7) and elution buffer (2% acetic acid), then equilibrated with binding buffer.
  • PEG filtrate was processed from human plasma cryoprecipitate at Bayer Corp. (Clayton, NC). This material contained vWF, FVIII, significant fibrinogen, fibronectin, and IgM.
  • the PEG filtrate was treated with 1 % TNBP (tri-n-butylphosphate) and 0.5% Tween 20 (from Aldrich) at 30° C for 3 hours. After the treatment the mixture was directly injected onto peptide affinity columns.
  • TNBP tri-n-butylphosphate
  • Tween 20 from Aldrich
  • Protein concentrations were monitored by A 280 absorbance. Samples were characterized using vWF ELISA. Briefly, anti-vWF antibody (from Accurate Inc. NY) was coated on each well of a microtiter plate (96 wells from Corning, NY 14831) overnight using 100 ⁇ l solution of antibody diluted 200 times in 0.1 M sodium bicarbonate buffer at pH 9.6. Each well was then blocked with 300 ⁇ l solution of 1 % BSA in PBS for 1 hour at room temperature. The plate was washed 5 times with PBS. Pure vWF and the collected samples were diluted to a concentration range between 0.02 to 0.2 ⁇ g/ml using 1 mg/ml BSA in PBS.
  • Each sample (100 ⁇ l) was incubated with the anti-vWF coated well for 1 hour at room temperature and the plate was washed 5 times with PBS plus 0.1 % Tween 20.
  • a second anti-vWF antibody with horse radish peroxidase (HRP) conjugate (from DAKO, Glostrup, Denmark) at a concentration of 1 to 500 dilution was introduced to each well and incubated for 1 hour at room temperature. The plate was washed again with PBS plus 0.1 % Tween 20 for 5 times.
  • HRP horse radish peroxidase
  • Substrate ABTS (2,2'-azino-bis(3-ethylbenz-thiazoline-6-sulfonic acid)
  • H 2 O 2 was used for the kinetic reading at 410 nm using Bio Kinetics Reader from BioTek (Winooski, VT).
  • the molecular weights and purity of the collected samples were determined by SDS-PAGE under reducing conditions using Phastsystem from Pharmacia (Piscataway, NJ). To determine the multimers of vWF, 1.5% agarose gel electrophoresis was used. The agarose gel electrophoresis was performed on the BioRad mini gel system.
  • Adsorption isotherms were measured in a batch mode.
  • a siliconized microcentrifuge tube 0.1 ml wet gel was mixed with vWF solution of 10 mM HEPES, 5 mM calcium chloride and 0.5 M sodium chloride at pH 7 in a total volume of 0.3 ml.
  • the microcentrifuge tube was incubated at 25° C for 20 minutes, then the gel was separated from the solution by microcentrifugation.
  • the concentrations of vWF in solutions were measured both by absorbance at 280 nm with an extinction coefficient of 1.2 for 1 mg/ml vWF and by ELISA.
  • vWF derived from human plasma was from Bayer Corp. (Berkeley, CA).
  • Koate® containing vWF, FVIII, and albumin was a product of Bayer Corp. (Clayton, NC).
  • Other chemicals used in our experiment were from Sigma in analytical grade or purer. All aqueous solutions were prepared using deionized water purified by Barnstead nanopure water purification system (Dubuque, IA).
  • Peptide RLRSFY was directly synthesized (25) onto a modified Toyopearl resin (-( ⁇ -Ala) 2 -Toyopearl) and the resin was packed in a 1 ml column (0.7x2.5cm).
  • Koate (Bayer's product containing vWF, FVIII and human albumin) was applied to the column at a flow rate of 2 ml/min in binding buffer (10 mM HEPES, 5 mM calcium chloride and 0.1 M NaCl, pH 7). After 1 min of washing in binding buffer, a linear gradient from 0.1 to 1 M NaCl in HEPES buffer was applied to the column over 5 min.
  • Table 1 also shows that total protein (represented as absorbance at 280 nm, A 280 ) recovered from the two columns are similar. Only one-half of the applied vWF is recovered from the peptide-Toyopearl column. This suggests that acid denatures a portion of the vWF during elution. This is confirmed by direct acid treatment then neutralization of vWF standards on the ELISA assay (data not shown).
  • vWF Interactions between RVRSFY directly synthesized on Toyopearl and vWF were studied through adsorption isotherm measurements. Because vWF consists of a wide range of molecular weights, complex theoretical analyses are required to obtain binding constants from the adsorption isotherms. In addition, different multimers of vWF may have different binding constants. To simplify the analyses, vWF with molecular weight around 1000 kDa was fractionated from Koate using size exclusion chromatography with Bio-Gel A-5M gel (BioRad) and analyzed by nonreducing agarose gel electrophoresis.
  • the adsorption isotherm in Figure 3 shows that at a given concentration of vWF, most of the vWF was adsorbed to the RVRSFY-Toyopearl.
  • the adsorption isotherm was fined using the Langmuir equation, resulting in an association constant of 1.31x10 6 (M -1 ).
  • the curve fit also showed that the maximum capacity of the resin was 15 mg vWF/ml resin, or approximately 60 mg vWF/g resin.
  • the peptide Ac-RVRSFYK-amide (SEQ ID NO: 14) was chemically synthesized and immobilized to the Toyopearl-Epoxy-650M resin through the C-terminal lysine.
  • the acetyl group at the N-terminus prevented the peptide from coupling to the resin at the N-terminal amine.
  • Peptide coupling efficiency and peptide density on the resin were monitored by reversed-phase HPLC. The coupling efficiencies were in the range of 95 to 75% corresponding to 5 to 60 mg peptide/ml.
  • FIG. 5 shows the effect of peptide density on the capture of vWF from Koate in the chromatography format.
  • the peptide density was less than 32 mg/ml, almost no capture of vWF was obtained.
  • the capture of vWF went through a transition from no capture to almost complete capture at 54 mg/ml density. This trend was consistent with that obtained from the adsorption isotherm measurements.
  • vWF was separated from 0.1 ml Koate using 0.4 ml column containing 54 mg/ml peptide Ac-RVRSFYK.
  • the fractions of flow through, salt (1 M NaCl), 0.5 M CaCl 2 , and 2% acetic acid elutions were collected and vWF activity in each fraction was measured by ELISA.
  • the CaCl 2 fraction contained 82.5% of total vWF, and the vWF recovered in all fractions was 87.8%. In comparison, when only 2% acetic acid was used for elution, 55.9% of total vWF was recovered (Table 2).
  • the N-terminal primary amine on the other hand, is unimportant. Thus other interactions play a part, such as hydrophobic bonding to the aliphatic or aromatic amino acids in the peptide.

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EP96114438A 1995-09-22 1996-09-10 Ligands peptidiques que se lient au facteur de Von Willebrand Ceased EP0785213A1 (fr)

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US537069 1995-09-22
US08/537,069 US5688912A (en) 1995-09-22 1995-09-22 Peptide ligands which bind to von willebrand factor

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EP (1) EP0785213A1 (fr)
JP (1) JPH09124696A (fr)
AU (1) AU706019B2 (fr)
CA (1) CA2185856A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11661593B2 (en) 2009-07-31 2023-05-30 Takeda Pharmaceutical Company Limited Methods of purifying recombinant ADAMTS13 and other proteins and compositions thereof

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Publication number Priority date Publication date Assignee Title
AU755549B2 (en) * 1998-10-23 2002-12-12 Brigham And Women's Hospital Conformation-specific anti-von willebrand factor antibodies
US20070066551A1 (en) 2004-09-07 2007-03-22 Keefe Anthony D Aptamer medicinal chemistry
AU2005287273B2 (en) 2004-09-07 2011-05-12 Archemix Corp. Aptamers to von Willebrand Factor and their use as thrombotic disease therapeutics
US7566701B2 (en) 2004-09-07 2009-07-28 Archemix Corp. Aptamers to von Willebrand Factor and their use as thrombotic disease therapeutics
EP2499165B1 (fr) 2009-11-13 2016-09-14 Grifols Therapeutics Inc. Préparations contenant le facteur de von willebrand (vwf) et procédés, coffrets et utilisations s'y rapportant
WO2015066769A1 (fr) * 2013-11-08 2015-05-14 Csl Ltd. Procédé inédit de concentration du facteur de von willebrand ou de complexes en comportant

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US5200510A (en) * 1987-06-16 1993-04-06 Zymogenetics, Inc. Method for purifying factor viii:c, von willebrand factor and complexes thereof
US5110907A (en) * 1989-08-01 1992-05-05 Alpha Therapeutic Corporation Factor viii complex purification using heparin affinity chromatography

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 122, no. 11, 13 March 1995, Columbus, Ohio, US; abstract no. 122390, XP002024435 *
P Y HUANG ETE AL.: "Affinity purification of von Willebrand factor using ligands derived from peptide libraries", BIOORGANIC AND MEDICINAL CHEMISTRY, vol. 4, no. 5, May 1996 (1996-05-01), OXFORD, pages 699 - 708, XP000617231 *
V SOUTH ET AL.: "Identification of novel peptide antagonists for von Willebrand factor binding to the platelet glycoprotein Ib receptor from a phage epitope library", THROMBOSIS HAEMOSTASIS, vol. 73, no. 1, 1995, pages 144 - 150 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11661593B2 (en) 2009-07-31 2023-05-30 Takeda Pharmaceutical Company Limited Methods of purifying recombinant ADAMTS13 and other proteins and compositions thereof

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JPH09124696A (ja) 1997-05-13
US5688912A (en) 1997-11-18
AU6568996A (en) 1997-03-27
CA2185856A1 (fr) 1997-03-23
AU706019B2 (en) 1999-06-03

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